bump version for robot_model

bloom-release failed (probably a github hiccup) 
```
==> Checking for rosdistro fork on github...
Failed to fetch github API 'https://api.github.com/users/isucan/repos?page=2': HTTP Error 500: Internal Server Error
Failed to get a list of repositories for user: 'isucan'
Skipping the pull request...
```